因式分解(1)4a^2-9ab^2.(2)x^3y-4x^2y^2+4xy^3

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因式分解(1)4a^2-9ab^2.(2)x^3y-4x^2y^2+4xy^3因式分解(1)4a^2-9ab^2.(2)x^3y-4x^2y^2+4xy^3因式分解(1)4a^2-9ab^2.(2)x

因式分解(1)4a^2-9ab^2.(2)x^3y-4x^2y^2+4xy^3
因式分解(1)4a^2-9ab^2.(2)x^3y-4x^2y^2+4xy^3

因式分解(1)4a^2-9ab^2.(2)x^3y-4x^2y^2+4xy^3
(1)4a^2-9ab^2=a(4a-9b^2).
(2)x^3y-4x^2y^2+4xy^3=xy(x^2-4xy+4y^2)=xy(x-2y)^2
估计第一题你打错了,应该是(1)4a^3-9ab^2=a(4a^2-9b^2)=a(2a+3b)(2a-3b).